Stress Concentration of Endodontically Treated Molars Restored with Transfixed Glass Fiber Post: 3D-Finite Element Analysis

Abstract

The loss of dental structure caused by endodontic treatment is responsible for a decrease in tooth resistance, which increases susceptibility to fracture. Therefore, it is important that minimally invasive treatments be performed to preserve the dental structure and increase the resistance to fracture of endodontically treated posterior teeth. To evaluate under axial loads, using the finite element method, the stress distribution in endodontically treated molars restored with both transfixed or vertical glass fiber posts (GFP) and resin composite. An endodontically treated molar 3D-model was analyzed using finite element analyses under four different conditions, class II resin composite (G1, control model), vertical glass fiber post (G2), transfixed glass fiber posts (G3) and vertical and transfixed glass fiber posts (G4). Ideal contacts were considered between restoration/resin composite and resin composite/tooth. An axial load (300 N) was applied to the occlusal surface. The resulting tensile stresses were calculated for the enamel and dentin tissue from five different viewports (occlusal, buccal, palatal, mesial and distal views). According to the stress maps, similar stress trends were observed, regardless of the glass fiber post treatment. In addition, for the G1 model (without GFP), a high-stress magnitude can be noticed in the proximal faces of enamel (7.7 to 14 MPa) and dentin (2.1 to 3.3 MPa) tissue. The use of transfixed glass fiber post is not indicated to reduce the stresses, under axial loads, in both enamel and dentin tissue in endodontically treated molar with a class II cavity.

Effect of Biologically Oriented Preparation Technique on the Stress Concentration of Endodontically Treated Upper Central Incisor Restored with Zirconia Crown: 3D-FEA

“…The finite element analysis (FEA) makes it possible to predict the mechanical and structural behavior of materials and biological structures through a non-destructive and mathematical approach [ 44 ]. In addition important oral conditions such as the microbiological aspects from each patient should be considered in further in vivo evaluations [ 45 , 46 , 47 ].…”

Biomechanical Performance of Mandibular Molars with Deep Mesio-Occlusal-Distal Cavities Rehabilitated with Horizontal Posts: A 3D Finite Element Analysis

“…In this study, too transfixed fiber post was assessed for stress distribution during mastication but the effect of different diameters of fiber post was also evaluated. The main difference in both studies was that in Borges et al's [ 29 ] study, the stress generation pattern was assessed in endodontically treated teeth, but in our study, the study groups were vital teeth with mesiodistal cavities. As the teeth were vital, the pattern of biomechanical stress generation, distribution, and cuspal deflection is incomparable.…”

“…Borges et al [ 29 ] evaluated the concentration and distribution of stress endodontically treated teeth with transfixed glass fiber posts. The different simulated conditions which were evaluated were composite resin as control, vertical fiber posts for rehabilitation, transfixed glass fiber posts used alone, and a combination of vertical glass fiber posts and transfixed horizontal posts.…”

Comparative Evaluation of Different Post Materials on Stress Distribution in Endodontically Treated Teeth Using the Finite Element Analysis Method: A Systematic Review

“…Different post materials produce different stresses on restored teeth. FEA is the most widely used numerical method, allowing the reproduction of mechanical behavior under a mechanical load based on the properties of the materials [ 30 ]. To evaluate the stress distribution of these different post materials, many in vitro studies were conducted by using finite element analysis but a consistent conclusion has not been established.…”